Process for manufacturing terephthalic acid
AssigneeSunkyong Industries Co., Ltd.
InventorsHang-Duk Roh, Dongmok Bae
Life of this patent
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Abstract
This invention relates to a process for manufacturing terephthalic acid and more particularly, to a process for manufacturing and recovering the highly purified terephthalic acid, in accordance with the practice of this invention comprising the following procedurses: alkali weight-reduction waste water discharged from weight-reduction process in a polyester textile dyeing complex is dissolved in water, adsorbed to remove impurities, and through acid-neutralization, terephthalic acid of this invention may be obtained.
Claims11
A process for manufacturing terephthalic acid from alkali weight reduction waste water, comprising:
- separating dialkali terephthalic acid from impurities to produce a separated aqueous solution comprising dialkali terephthalic acid, said separating comprising adsorbing said alkali weight reduction waste water onto a filling material, wherein said alkali weight reduction water has a pH above the first equivalence point of terephthalic acid and comprises dialkali terephthalic acid;
- and thereafter:
- neutralizing said separated aqueous solution which comprises dialkali terephthalic acid with acid to produce terephthalic acid;
- crystallizing said terephthalic acid to enlarge the particle size of the crystals of terephthalic acid;
- cooling said enlarged crystals of terephthalic acid;
- filtering said enlarged crystals of terephthalic acid;
- and
- drying said enlarged crystals of terephthalic acid.
An apparatus for manufacturing terephthalic acid from alkali weight reduction waste water, comprising:
- a dissolving tank for containing said alkali weight reduction waste water;
- a centrifuge in communication with said dissolving tank;
- an absorption tower in communication with said centrifuge;
- a neutralization tank which is in communication with said adsorption tower and wherein said alkali weight reduction waste water is neutralized to produce terephthalic acid;
- a crystallization tank which is in communication with said neutralization tank and wherein enlarging the particle size of the crystals of terephthalic acid may occur;
- a cooling system which is in communication with said dissolving tank and said crystallization tank;
- a filtering system which is in communication with said cooling system and wherein the enlarged crystals of terephthalic acid are filtered;
- and
- a drying system which is in communication with said filtering system.
Dependencies are inferred from the claim text.